weird that USB does not work. maybe change grub boot params to turn off ACPI? some hardware, especially if you go back a few years but even now, has buggy bios-es that don't do that right thing, which screws interrupts. you can try apci=off on the boot param list in grub and see if that doesn't help

webcams are harder. webcam vendors have been bad about opening drivers or even for tolerating people writing open drivers in some cases. I don't know why shops think that it is a win to make it hard for people to buy your product, but they do.

side note in the no-joke department: if you run linux and want to buy an album in mp3 format on Amazon, you can't just download all of the tracks at once. Rather you have to download them one by one. Amazon actively defeated workaround tools so to really enforce this ( I had been using clamz happily for a bit but no longer). the other day I wanted to spend over a $100 to buy all of Ryan Adams _Live after Deaf_ only to find that I'd have to download the 174 tracks one by one. Just because I use linux? I cancelled the order. I really don't get why vendors of any sort think it is a win to shrink their market. Doubly so when the market is predicated on open internet protocols creating the market in the first place ( as is the case for things like webcams and cloud retailing music ).

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